Channelized binary-level radiometer

Details Channelized binary-level radiometer Channelized binary-level radiometer

1989-10-04

1990-09-11

Tarcza, Thomas H.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a radiometer

375 1, 342 20, 340600, 324 77E, G01S 302

Patent

active

049566440

ABSTRACT:
A signal detector for receiving a wide band (W) of frequency-hopped signals which channelizes the incoming signals, via filter banks into a plurality (L) of channels. Magnitude squaring circuits in each channel generate a "power" estimate which is compared to a preset threshold value by threshold-quantizer units that produce a positive voltage (=1) if the threshold is exceeded. After summation of all the channels, the direct sequence (DS) signal component and noise component are processed so that a DC voltage is produced if a frequency-hop signal (FH) is present which is greater in value than when the signal is not present. Thus the DC signal indicates whether the FH signal is present or absent.

REFERENCES:
patent: 2862204 (1958-11-01), Henrici et al.
patent: 3210762 (1965-10-01), Brabant
patent: 3215934 (1965-11-01), Sallen
patent: 3660844 (1972-05-01), Potter
patent: 3922676 (1975-11-01), O'Berry et al.
patent: 4079380 (1978-03-01), Esry et al.
patent: 4860013 (1989-08-01), Huntley
patent: 4864309 (1989-09-01), Wiley et al.

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